Printable Hard Sudoku

Set 5zihyt. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
3 1
6 8 4
4 1 8 2 3
6 7
2 5 7
4 5 7 3 1
3 4 2 7 5
2 4 9
9
Hard #2
7 3 9
6 5 8
1 8 3 6
4 8 6 7
6 3 2
1 6 5 9
5 2 9 8
9 7
7 2
Hard #3
3 4 7 5 6
4 9
8 7 2
9 1 3
5 4
1 8 2 3 9
6 8
9 2 6
6 9 7 2
Hard #4
7 6 9
3 5 9 7 2
8 4 1 6 3
1
7 3
6 2 9 8 5
1 2 5
2 1
4 8 9
Hard #5
7 5 9
2 9 1 6
5 7 1 3
4 6 2 3
9 4 6
3 9 2
7 1
3 4 7
9 6 8
Hard #6
9 1 8 7
3 1 9 2 8
4 6 1
3
6 4 2 1 9
8 2 5 4
1 4 3
8 1 4
5
Hard #7
4 6 8
2 8
1 2 5
2 5 1
8 3 9 2
1 7 6 8
6 7 4
3 5 7
8 5 4 9
Hard #8
3 4 7 6 5
8 2 1
7 8
9 2
3 4 6
6 8 5 7 1
1 6 5 4
8 4 3
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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